policystrata 0.1.4

Cross-layer policy regression testing for LLM data-agent stacks

PolicyStrata

PolicyStrata is a deterministic regression-testing framework for cross-layer policy drift in LLM data-agent stacks.

It generates principals, requests, semantic plans, database states, lowered queries, and release decisions; compares each layer against a canonical reference policy; and minimizes failures into small reproducible witnesses.

Use it when you are building text-to-SQL agents, BI copilots, internal analytics agents, warehouse chat systems, or governed enterprise LLM tools and need to know whether prompts, manifests, semantic plans, validators, SQL compilers, database controls, and output filters still agree about policy.

PolicyStrata is not an authorization boundary, and it is not another generic text-to-SQL benchmark. It is a reproducible research artifact and regression gate for finding reachable disagreements between layers.

Quick Start

From PyPI:

uvx policystrata demo
pipx run policystrata demo

From a source checkout:

uv sync --extra dev
uv run policystrata demo

The demo runs the built-in support_saas fixture, writes traces and minimized witnesses to runs/demo, and prints the drift classes it found. Use --out to choose another output directory:

uv run policystrata demo --out runs/demo

No LLM API key is required for deterministic tests, benchmark runs, or the built-in demo.

Install

PolicyStrata is a CLI-first Python package. The public package provides the policystrata console script and importable Python modules.

python -m pip install policystrata
policystrata demo

For one-off CLI use without managing an environment:

uvx policystrata demo
pipx run policystrata demo

Repository examples under examples/, Docker Compose fixtures, and evidence scripts are available from a GitHub checkout or source distribution. The wheel installs the runtime package, built-in domain fixtures, and packaged scanner examples reachable through policystrata init-scan.

Use As A Template

Click Use this template on GitHub, then start with the deterministic fixtures:

uv sync --extra dev
uv run policystrata run --domain support_saas --suite seeded --out runs/example
uv run policystrata summarize runs/example

To copy a built-in domain fixture into your tree:

uv run policystrata init-domain support_saas --out examples/my-policystrata-domain

Keep custom integrations as adapters. The policy oracle should stay independent from SQL compiler behavior, external eval frameworks, and model-provider behavior.

What It Tests

The core failure class is cross-layer policy drift:

Canonical policy:
  Analysts may view tenant-scoped aggregate ticket counts, but not customer-level PII.

Model-visible manifest or grammar:
  Accidentally exposes customer_email as a dimension.

SQL compiler:
  Accidentally drops the tenant predicate while lowering an authorized aggregate.

Output layer:
  Releases the result because the final answer looks like a summary.

PolicyStrata result:
  A minimized witness localizes the violated layer and failed obligation.

PolicyStrata does not assume every layer should behave identically. Each surface has a declared responsibility:

• manifest: expose model-visible capabilities without stale or forbidden options.
• grammar: parse the declared intent space and preserve untrusted intent for validation.
• validator: authorize semantic queries and bind principal, tenant, time, and budget obligations.
• compiler: lower authorized semantic IR into SQL while preserving metric, tenant, time, and row obligations.
• database: contain row access with RLS and other database-side controls.
• release: withhold contained or unauthorized results.

See docs/failure-taxonomy.md for how witness classes map to concrete policy-drift failures.

Run Benchmarks

PolicyStrata ships with deterministic support_saas, finance_saas, and analytics_clickhouse benchmarks, generated mutation suites, held-out suite support, clean controls, minimized witnesses, JSONL traces, baseline comparisons, and evidence tables.

uv run policystrata run --domain support_saas --suite seeded --out runs/example
uv run policystrata run \
  --domain support_saas \
  --suite generated \
  --count 500 \
  --seed 1729 \
  --out runs/generated
uv run policystrata run --domain finance_saas --suite seeded --out runs/finance
uv run policystrata freeze-benchmark --domain support_saas --suite heldout_v1 --count 500 --seed 260626 --out runs/freeze/support-heldout-v1.json
uv run policystrata run --domain support_saas --suite heldout_v1 --count 500 --seed 260626 --freeze-manifest runs/freeze/support-heldout-v1.json --out runs/support-heldout-v1
uv run policystrata baselines runs/example runs/support-heldout-v1
uv run policystrata ablations runs/example runs/support-heldout-v1

The default run command writes:

runs/<id>/traces.jsonl
runs/<id>/summary.json
runs/<id>/metadata.json
runs/<id>/benchmark_manifest.json  # for frozen runs
runs/<id>/witnesses/*.json

metadata.json records the mutation operator set, suite provenance, evidence level, and detector-freeze status. Frozen runs verify the manifest before writing traces. Static suite YAML can declare suite_metadata so externally authored, detector-frozen, or incident-reconstruction cases stay separate from public/generated benchmark scores.

Regenerate paper-style evidence tables with:

scripts/reproduce-evidence.sh
scripts/reproduce-final.sh

Generate reviewer-facing artifact metrics for a run:

uv run policystrata artifact-report runs/repro/seeded

Current benchmark details are in docs/evidence.md, with methodology and claim boundaries in docs/methodology.md and EVAL_CARD.md.

Run The Scanner

policystrata scan is the production-oriented path. It treats PolicyStrata as a scanner and release gate, not as the authorization boundary.

Create a scanner scaffold for an application:

uv run policystrata init-scan --out policystrata
uv run policystrata scan --config policystrata/policystrata.yaml --out runs/policystrata-smoke

The scaffold writes policystrata.yaml, domain/policy.yaml, domain/surfaces.yaml, and traces.example.jsonl. Replace the example trace with exported SQL/tool-call traces from your app. Use --source-domain finance_saas to scaffold the finance policy and a matching finance trace instead of the default support SaaS example.

Copy a packaged Postgres/dbt scanner example from an installed wheel:

uvx policystrata init-scan postgres_dbt --out policystrata-example
uvx policystrata scan --config policystrata-example/policystrata_clean.yaml --out runs/scan-clean

Clean smoke test:

uv run policystrata scan --config examples/postgres_dbt/policystrata_clean.yaml --out runs/scan-clean

Intentional gate-failure fixture:

uv run policystrata scan --config examples/postgres_dbt/policystrata.yaml --out runs/scan

That fixture should exit 1 because it contains imported traces with known authorization, unsafe-release, and tenant-scope findings.

Scanner outputs include:

runs/scan-clean/scan.json
runs/scan-clean/findings.jsonl
runs/scan-clean/summary.json
runs/scan-clean/report.md
runs/scan-clean/witnesses/*.json
runs/scan-clean/scan.sarif  # when sarif: true

For a scanner run that also executes imported SQL beside canonical compiler SQL against the Docker/PostgreSQL fixture:

docker compose up -d postgres
uv run policystrata scan --config examples/postgres_dbt/policystrata_real_db_clean.yaml --out runs/scan-real-db-clean

Postgres access goes through Python/psycopg; host psql is not required. See docs/scanner.md for scanner configuration, gate behavior, tenancy config, remediation fields, state assertions, and real-database fixture details. See docs/trace-contract.md, docs/trace-adapters.md, and docs/testing-ai-data-assistant.md for imported-trace contracts and framework recipes.

GitHub Action

Use the first-party action to run policystrata scan as a pull-request or release gate:

name: PolicyStrata

on:
  pull_request:
  push:
    branches: [main]

jobs:
  scan:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

      - uses: raintree-technology/policystrata@v0.1.4
        with:
          config: policystrata.yaml
          out: runs/policystrata

See docs/github-action.md for inputs, artifact upload, and database fixture guidance.

Integrations And Exports

PolicyStrata keeps core execution independent from external eval frameworks. Adapter exports are available for downstream systems:

uv run policystrata export runs/example --format inspect --out runs/example/inspect.jsonl
uv run policystrata export runs/example --format benchflow --out runs/example/benchflow.json

The repo also includes a small dbt Semantic Layer adapter and fixture:

uv run policystrata check-integration dbt-semantic \
  --domain finance_saas \
  --path examples/integrations/dbt_semantic/finance_saas/semantic_models.yml

See docs/trace-interop.md for adapter field mappings.

TypeScript / Node SDK

The repository includes a first-party TypeScript recorder under packages/node for Next.js, Drizzle, and other Node agent stacks:

import { createPolicyStrataRecorder } from "policystrata/node";

const recorder = createPolicyStrataRecorder({
  service: "betteroff-ask-ai",
  out: ".policystrata/traces.jsonl",
  tenancy: {
    tenantColumns: ["transactions.household_id", "accounts.household_id"],
  },
});

wrapTool() records sanitized tool executions, captureQuery() captures Drizzle .toSQL() output when available, and read-tool SQL records can be scanned with policystrata scan.

Reference Docs

• docs/benchmark-reference.md: domains, generated mutants, baselines, and witness shape.
• docs/scanner.md: scanner inputs, gates, state assertions, and PostgreSQL fixture use.
• docs/github-action.md: CI wrapper for policystrata scan.
• docs/distribution-roadmap.md: CLI, GitHub Action, SDK, MCP, and GitHub CLI extension sequence.
• docs/evidence.md: current evidence snapshot and reproduction commands.
• docs/methodology.md: claims, limitations, mutant definitions, and witness minimization.
• EVAL_CARD.md: benchmark provenance, evidence levels, and eval boundaries.
• docs/open-source-commercial-strategy.md: packaging and product boundary.

Development

uv run pytest
uv run ruff check .
uv run mypy src

The built-in support_saas domain is deterministic and seed-driven. Preserve JSON/YAML trace stability when extending artifacts; add fields compatibly.

Status

PolicyStrata is an early research artifact. It is useful for reproducing the paper's core failure model and for building regression gates around real stacks. It does not prove recall on unknown production incidents, and it should not be represented as a production security scanner by itself.